The atypical emission - line star Hen 3 - 209 ⋆
نویسنده
چکیده
We analyse observations, spanning 15 years, dedicated to the extreme emission-line object Hen 3-209. Our photometric data indicate that the luminosity of the star undergoes marked variations with a peak-to-peak amplitude of 0.65 mag. These variations are recurrent, with a period of 16.093±0.005 d. The spectrum of Hen 3-209 is peculiar with many different lines (H , He , Fe ,...) showing P Cygni profiles. The line profiles are apparently changing in harmony with the photometry. The spectrum also contains [O ] lines that display a saddle profile topped by three peaks, with a maximum separation of about 600 km s−1. Hen 3-209 is most likely an evolved luminous object suffering from mass ejection events and maybe belonging to a binary system.
منابع مشابه
Evidence for Accretion in the High - resolution X - ray Spectrum of the T Tauri Star System Hen 3 - 600
We present high-resolution X-ray spectra of the nearby, multiple T Tauri star (TTS) system Hen 3-600, obtained with the High Energy Transmission Grating Spectrograph (HETGS) aboard the Chandra X-ray Observatory (CXO). Both principle binary components of Hen 3-600 (A and B, separation 1.4) were detected in the zeroth-order CXO/HETGS X-ray image. Hen 3-600-A — the component with a large mid-infra...
متن کاملThe Henize sample of S stars IV . New symbiotic stars ⋆
The properties of the few symbiotic stars detected among the 66 binary S stars from the Henize sample are discussed. Two stars (Hen 18 and Hen 121) exhibit both a strong blue-violet continuum and strong Hα emission (FWHM of 70 km s ), whereas Hen 134 and 137 exhibit weak Hα emission. The Hα profiles are typical of non-dusty symbiotic stars belonging to class S-3 as defined by Van Winckel et al....
متن کاملLong term spectral variability of Hen 3-640 (A1118-61)
We present spectroscopic observations of the peculiar emission line star Hen 3-640, the optical counterpart of the hard X-ray source A 1118-61, from 1985 to 1997. Our data confirm strong spectral variability (both on long and short time scales) of the star and the correlation between the hard X-ray flux and the Hα equivalent width. We also found a significant Hα/Hβ flux ratio variability during...
متن کاملSpectroscopy of B - type emission - line stars with compact dusty envelopes : HD 85567 , Hen 3 – 140 , and Hen 3 – 1398
We report the results of our spectroscopic observations (3600–5900 Å, R ≃ 16 000 and 5750–8750 Å, R ≃ 11 000) of three southern emission-line B–type stars associated with IRAS sources, HD 85567, Hen 3–140, and Hen 3–1398, whose nature and evolutionary state are not well-established yet. We also obtained new multicolour photometry of HD 85567 (UBV (RI)cJHKL) and Hen 3–140 (JHKLM). A large near-I...
متن کاملThe enigmatic B [ e ] - star Henize 2 - 90 : The non - spherical mass loss history from an analysis of forbidden lines ⋆ ⋆ ⋆
We study the optical spectrum of the exciting B[e] star Hen 2-90 based on new high-resolution observations that cover the innermost 2 ′′ of the object whose total extent is more than 3 ′′. Our investigation is splitted in two parts, a qualitative study of the presence of the numerous emission lines and the classification of their line profiles which indicate a circumstellar environment of high ...
متن کامل